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<h1>Iron(II,III) oxide, Fe<sub>3</sub>O<sub>4</sub></h1>

Iron(II,III) oxide (Fe<sub>3</sub>O<sub>4</sub>), also known as magnetite, is a black, magnetic mineral with multiple applications, including in the field of optics. It possesses unique magnetic properties that make it ideal for magneto-optical recording and sensing technologies. The material's interaction with light can be modified by external magnetic fields, providing a platform for tunable optical devices. Additionally, Fe<sub>3</sub>O<sub>4</sub> nanoparticles have garnered attention for use in photothermal therapy, owing to their capacity to absorb near-infrared radiation and convert it to heat. This compound combines magnetic and optical functionalities, offering a unique palette of features for contemporary optical research and applications.

<h2>Other names</h2>
<ul>
<li>Ferrous ferric oxide</li>
<li>Ferroso ferric oxide</li>
<li>Black iron oxide</li>
<li>Rust</li>
<li>Iron(II) diiron(III) oxide</li>
<li>Iron oxide</li>
<li>Triiron tetraoxide</li>
</ul>

<h2>Minerals</h2>
<ul>
<li>Magnetite</li>
<li>Lodestone (naturally magnetized magnetite)</li>
</ul>

<h2>External links</h2>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Iron(II,III)_oxide">Iron(II,III) oxide - Wikipedia</a></li>
<li><a href="https://www.webelements.com/compounds/iron/triiron_tetraoxide.html">Triiron tetraoxide - WebElements</a></li>
<li><a href="https://en.wikipedia.org/wiki/Magnetite">Magnetite - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Lodestone">Lodestone - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Rust">Rust - Wikipedia</a></li>
</ul>
